362 lines
13 KiB
C
362 lines
13 KiB
C
/****************************************************************************
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* include/nuttx/addrenv.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_ADDRENV_H
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#define __INCLUDE_NUTTX_ADDRENV_H 1
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_BUILD_KERNEL
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# include <signal.h>
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# include <nuttx/mm/mm.h>
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#endif
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#ifdef CONFIG_ARCH_ADDRENV
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Pre-requisites */
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#ifndef CONFIG_MM_PGALLOC
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# error CONFIG_MM_PGALLOC not defined
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#endif
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#ifndef CONFIG_MM_PGSIZE
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# error CONFIG_MM_PGSIZE not defined
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#endif
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/* .text region */
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#ifndef CONFIG_ARCH_TEXT_VBASE
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# error CONFIG_ARCH_TEXT_VBASE not defined
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# define CONFIG_ARCH_TEXT_VBASE 0
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#endif
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#if (CONFIG_ARCH_TEXT_VBASE & CONFIG_MM_MASK) != 0
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# error CONFIG_ARCH_TEXT_VBASE not aligned to page boundary
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#endif
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#ifndef CONFIG_ARCH_TEXT_NPAGES
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# warning CONFIG_ARCH_TEXT_NPAGES not defined
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# define CONFIG_ARCH_TEXT_NPAGES 1
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#endif
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#define ARCH_TEXT_SIZE (CONFIG_ARCH_TEXT_NPAGES * CONFIG_MM_PGSIZE)
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#define ARCH_TEXT_VEND (CONFIG_ARCH_TEXT_VBASE + ARCH_TEXT_SIZE)
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/* .bss/.data region */
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#ifndef CONFIG_ARCH_DATA_VBASE
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# error CONFIG_ARCH_DATA_VBASE not defined
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# define CONFIG_ARCH_DATA_VBASE ARCH_TEXT_VEND
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#endif
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#if (CONFIG_ARCH_DATA_VBASE & CONFIG_MM_MASK) != 0
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# error CONFIG_ARCH_DATA_VBASE not aligned to page boundary
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#endif
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#ifndef CONFIG_ARCH_DATA_NPAGES
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# warning CONFIG_ARCH_DATA_NPAGES not defined
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# define CONFIG_ARCH_DATA_NPAGES 1
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#endif
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#define ARCH_DATA_SIZE (CONFIG_ARCH_DATA_NPAGES * CONFIG_MM_PGSIZE)
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#define ARCH_DATA_VEND (CONFIG_ARCH_DATA_VBASE + ARCH_DATA_SIZE)
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/* Reserved .bss/.data region. In the kernel build (CONFIG_BUILD_KERNEL),
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* the region at the beginning of the .bss/.data region is reserved for use
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* by the OS. This reserved region contains support for:
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*
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* 1. The task group's heap memory management data structures and
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* 2. Support for delivery of signals.
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*
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* We don't use sizeof(struct addrenv_reserve_s) but, instead, a nice
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* even number that we must be assure is greater than or equal to
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* sizeof(struct addrenv_reserve_s)
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*/
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#ifdef CONFIG_BUILD_KERNEL
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# define ARCH_DATA_RESERVE_SIZE 512
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#else
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# define ARCH_DATA_RESERVE_SIZE 0
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#endif
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/* Heap region */
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#ifndef CONFIG_ARCH_HEAP_VBASE
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# error CONFIG_ARCH_HEAP_VBASE not defined
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# define CONFIG_ARCH_HEAP_VBASE ARCH_DATA_VEND
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#endif
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#if (CONFIG_ARCH_HEAP_VBASE & CONFIG_MM_MASK) != 0
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# error CONFIG_ARCH_HEAP_VBASE not aligned to page boundary
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#endif
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#ifndef CONFIG_ARCH_HEAP_NPAGES
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# warning CONFIG_ARCH_HEAP_NPAGES not defined
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# define CONFIG_ARCH_HEAP_NPAGES 1
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#endif
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#define ARCH_HEAP_SIZE (CONFIG_ARCH_HEAP_NPAGES * CONFIG_MM_PGSIZE)
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#define ARCH_HEAP_VEND (CONFIG_ARCH_HEAP_VBASE + ARCH_HEAP_SIZE)
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#ifdef CONFIG_ARCH_STACK_DYNAMIC
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/* User stack region */
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# ifndef CONFIG_ARCH_STACK_VBASE
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# error CONFIG_ARCH_STACK_VBASE not defined
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# define CONFIG_ARCH_STACK_VBASE ARCH_HEAP_VEND
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# endif
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# if (CONFIG_ARCH_STACK_VBASE & CONFIG_MM_MASK) != 0
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# error CONFIG_ARCH_STACK_VBASE not aligned to page boundary
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# endif
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# ifndef CONFIG_ARCH_STACK_NPAGES
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# warning CONFIG_ARCH_STACK_NPAGES not defined
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# define CONFIG_ARCH_STACK_NPAGES 1
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# endif
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# define ARCH_STACK_SIZE (CONFIG_ARCH_STACK_NPAGES * CONFIG_MM_PGSIZE)
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# define ARCH_STACK_VEND (CONFIG_ARCH_STACK_VBASE + ARCH_STACK_SIZE)
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#ifdef CONFIG_ARCH_KERNEL_STACK
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/* Kernel stack */
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# ifndef CONFIG_ARCH_KERNEL_STACKSIZE
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# define CONFIG_ARCH_KERNEL_STACKSIZE 1568
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# endif
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#endif
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/* A single page scratch region used for temporary mappings */
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# define __ARCH_SHM_VBASE ARCH_STACK_VEND
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#else
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/* A single page scratch region used for temporary mappings */
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# define __ARCH_SHM_VBASE ARCH_HEAP_VEND
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#endif
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/* Shared memory regions */
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#ifdef CONFIG_MM_SHM
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# ifndef CONFIG_ARCH_SHM_VBASE
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# error CONFIG_ARCH_SHM_VBASE not defined
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# define CONFIG_ARCH_SHM_VBASE __ARCH_SHM_VBASE
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# endif
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# if (CONFIG_ARCH_SHM_VBASE & CONFIG_MM_MASK) != 0
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# error CONFIG_ARCH_SHM_VBASE not aligned to page boundary
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# endif
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# ifndef CONFIG_ARCH_SHM_MAXREGIONS
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# warning CONFIG_ARCH_SHM_MAXREGIONS not defined
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# define CONFIG_ARCH_SHM_MAXREGIONS 1
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# endif
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# ifndef CONFIG_ARCH_SHM_NPAGES
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# warning CONFIG_ARCH_SHM_NPAGES not defined
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# define CONFIG_ARCH_SHM_NPAGES 1
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# endif
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# define ARCH_SHM_MAXPAGES (CONFIG_ARCH_SHM_NPAGES * CONFIG_ARCH_SHM_MAXREGIONS)
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# define ARCH_SHM_REGIONSIZE (CONFIG_ARCH_SHM_NPAGES * CONFIG_MM_PGSIZE)
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# define ARCH_SHM_SIZE (CONFIG_ARCH_SHM_MAXREGIONS * ARCH_SHM_REGIONSIZE)
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# define ARCH_SHM_VEND (CONFIG_ARCH_SHM_VBASE + ARCH_SHM_SIZE)
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# define ARCH_SCRATCH_VBASE ARCH_SHM_VEND
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#else
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# define ARCH_SCRATCH_VBASE __ARCH_SHM_VBASE
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#endif
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/* There is no need to use the scratch memory region if the page pool memory
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* is statically mapped.
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*/
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#ifdef CONFIG_ARCH_PGPOOL_MAPPING
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# ifndef CONFIG_ARCH_PGPOOL_PBASE
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# error CONFIG_ARCH_PGPOOL_PBASE not defined
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# endif
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# ifndef CONFIG_ARCH_PGPOOL_VBASE
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# error CONFIG_ARCH_PGPOOL_VBASE not defined
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# endif
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# ifndef CONFIG_ARCH_PGPOOL_SIZE
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# error CONFIG_ARCH_PGPOOL_SIZE not defined
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# endif
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# define CONFIG_ARCH_PGPOOL_PEND \
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(CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_SIZE)
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# define CONFIG_ARCH_PGPOOL_VEND \
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(CONFIG_ARCH_PGPOOL_VBASE + CONFIG_ARCH_PGPOOL_SIZE)
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/* Reserved .bss/.data region. In the kernel build (CONFIG_BUILD_KERNEL),
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* the region at the beginning of the .bss/.data region is reserved for use
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* by the OS. This reserved region contains support for:
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*
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* 1. The task group's heap memory management data structures and
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* 2. Support for delivery of signals.
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*/
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#ifdef CONFIG_BUILD_KERNEL
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#ifndef CONFIG_DISABLE_SIGNALS
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/* This is the type of the signal handler trampoline routine. This
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* trampoline is called directly from kernel logic. It simply forwards the
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* signal information to the real signal handler. When the signal handler
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* returns, this function issues a system call in order to return in kernel
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* mode.
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*/
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typedef void (*addrenv_sigtramp_t)(_sa_sigaction_t sighand, int signo,
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FAR siginfo_t *info, FAR void *ucontext);
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#endif
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/* This structure describes the format of the .bss/.data reserved area */
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struct addrenv_reserve_s
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{
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#ifndef CONFIG_DISABLE_SIGNALS
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addrenv_sigtramp_t ar_sigtramp; /* Signal trampoline */
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#endif
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struct mm_heap_s ar_usrheap; /* User space heap structure */
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};
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/* Each instance of this structure resides at the beginning of the user-
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* space .bss/.data region. This macro is provided to simplify access:
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*/
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#define ARCH_DATA_RESERVE \
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((FAR struct addrenv_reserve_s *)CONFIG_ARCH_DATA_VBASE)
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Address Environment Interfaces
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*
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* Low-level interfaces used in binfmt/ to instantiate tasks with address
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* environments. These interfaces all operate on type group_addrenv_t which
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* is an abstract representation of a task group's address environment and
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* must be defined in arch/arch.h if CONFIG_ARCH_ADDRENV is defined.
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*
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* up_addrenv_create - Create an address environment
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* up_addrenv_destroy - Destroy an address environment.
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* up_addrenv_vtext - Returns the virtual base address of the .text
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* address environment
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* up_addrenv_vdata - Returns the virtual base address of the .bss/.data
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* address environment
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* up_addrenv_heapsize - Returns the size of the initial heap allocation.
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* up_addrenv_select - Instantiate an address environment
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* up_addrenv_restore - Restore an address environment
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* up_addrenv_clone - Copy an address environment from one location to
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* another.
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*
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* Higher-level interfaces used by the tasking logic. These interfaces are
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* used by the functions in sched/ and all operate on the thread which whose
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* group been assigned an address environment by up_addrenv_clone().
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*
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* up_addrenv_attach - Clone the address environment assigned to one TCB
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* to another. This operation is done when a pthread
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* is created that share's the same group address
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* environment.
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* up_addrenv_detach - Release the thread's reference to an address
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* environment when a task/thread exits.
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*
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* CONFIG_ARCH_STACK_DYNAMIC=y indicates that the user process stack resides
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* in its own address space. This options is also *required* if
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* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why?
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* Because the caller's stack must be preserved in its own address space
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* when we instantiate the environment of the new process in order to
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* initialize it.
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*
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* NOTE: The naming of the CONFIG_ARCH_STACK_DYNAMIC selection implies that
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* dynamic stack allocation is supported. Certainly this option must be set
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* if dynamic stack allocation is supported by a platform. But the more
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* general meaning of this configuration environment is simply that the
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* stack has its own address space.
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*
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* If CONFIG_ARCH_STACK_DYNAMIC=y is selected then the platform specific
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* code must export these additional interfaces:
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*
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* up_addrenv_ustackalloc - Create a stack address environment
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* up_addrenv_ustackfree - Destroy a stack address environment.
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* up_addrenv_vustack - Returns the virtual base address of the stack
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* up_addrenv_ustackselect - Instantiate a stack address environment
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*
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* If CONFIG_ARCH_KERNEL_STACK is selected, then each user process will have
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* two stacks: (1) a large (and possibly dynamic) user stack and (2) a
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* smaller kernel stack. However, this option is *required* if both
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* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why? Because
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* when we instantiate and initialize the address environment of the new
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* user process, we will temporarily lose the address environment of the old
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* user process, including its stack contents. The kernel C logic will crash
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* immediately with no valid stack in place.
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*
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* If CONFIG_ARCH_STACK_DYNAMIC=y is selected then the platform specific
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* code must export these additional interfaces:
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*
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* up_addrenv_kstackalloc - Create a stack in the kernel address environment
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* up_addrenv_kstackfree - Destroy the kernel stack.
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*
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****************************************************************************/
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/* Prototyped in include/nuttx/arch.h as part of the OS/platform interface */
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_ARCH_ADDRENV */
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#endif /* __INCLUDE_NUTTX_ADDRENV_H */
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